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mvsocts.c revision 1.1.4.2 
      1 /*	$NetBSD: mvsocts.c,v 1.1.4.2 2012/10/30 17:19:06 yamt Exp $	*/
      2 /*
      3  * Copyright (c) 2012 KIYOHARA Takashi
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     25  * POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 #include <sys/cdefs.h>
     28 __KERNEL_RCSID(0, "$NetBSD: mvsocts.c,v 1.1.4.2 2012/10/30 17:19:06 yamt Exp $");
     29 
     30 #include <sys/param.h>
     31 #include <sys/bus.h>
     32 #include <sys/device.h>
     33 #include <sys/errno.h>
     34 
     35 #include <dev/sysmon/sysmonvar.h>
     36 
     37 #include <dev/marvell/marvellvar.h>
     38 
     39 #define TS_STATUS		0x0
     40 #define   STATUS_VALID			(1 << 9)
     41 #define   STATUS_VAL(v)			(((v) >> 10) & 0x1ff)
     42 
     43 #define VAL2MCELSIUS(v)		(((322 - (v)) * 10000) / 13625)
     44 
     45 struct mvsocts_softc {
     46 	device_t sc_dev;
     47 
     48 	struct sysmon_envsys *sc_sme;
     49 	envsys_data_t sc_sensor;
     50 
     51 	bus_space_tag_t sc_iot;
     52 	bus_space_handle_t sc_ioh;
     53 };
     54 
     55 
     56 static int mvsocts_match(device_t, struct cfdata *, void *);
     57 static void mvsocts_attach(device_t, device_t, void *);
     58 
     59 static void mvsocts_refresh(struct sysmon_envsys *, envsys_data_t *);
     60 
     61 CFATTACH_DECL_NEW(mvsocts, sizeof(struct mvsocts_softc),
     62     mvsocts_match, mvsocts_attach, NULL, NULL);
     63 
     64 
     65 /* ARGSUSED */
     66 static int
     67 mvsocts_match(device_t parent, struct cfdata *match, void *aux)
     68 {
     69 	struct marvell_attach_args *mva = aux;
     70 
     71 	if (strcmp(mva->mva_name, match->cf_name) != 0)
     72 		return 0;
     73 	return 1;
     74 }
     75 
     76 /* ARGSUSED */
     77 static void
     78 mvsocts_attach(device_t parent, device_t self, void *aux)
     79 {
     80         struct mvsocts_softc *sc = device_private(self);
     81 	struct marvell_attach_args *mva = aux;
     82 
     83 	aprint_naive("\n");
     84 	aprint_normal(": Marvell SoC Thermal Sensor\n");
     85 
     86 	sc->sc_dev = self;
     87 	sc->sc_iot = mva->mva_iot;
     88 	if (bus_space_subregion(mva->mva_iot, mva->mva_ioh,
     89 	    mva->mva_offset, sizeof(uint32_t), &sc->sc_ioh))
     90 		panic("%s: Cannot map registers", device_xname(self));
     91 
     92 	sc->sc_sme = sysmon_envsys_create();
     93 	/* Initialize sensor data. */
     94 	sc->sc_sensor.units =  ENVSYS_STEMP;
     95 	sc->sc_sensor.state =  ENVSYS_SINVALID;
     96 	strlcpy(sc->sc_sensor.desc, device_xname(self),
     97 	    sizeof(sc->sc_sensor.desc));
     98 	if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) {
     99 		aprint_error_dev(self, "Unable to attach sysmon\n");
    100 		sysmon_envsys_destroy(sc->sc_sme);
    101 		return;
    102 	}
    103 
    104 	/* Hook into system monitor. */
    105 	sc->sc_sme->sme_name = device_xname(self);
    106 	sc->sc_sme->sme_cookie = sc;
    107 	sc->sc_sme->sme_refresh = mvsocts_refresh;
    108 	if (sysmon_envsys_register(sc->sc_sme)) {
    109 		aprint_error_dev(self, "Unable to register with sysmon\n");
    110 		sysmon_envsys_destroy(sc->sc_sme);
    111 	}
    112 }
    113 
    114 static void
    115 mvsocts_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
    116 {
    117 	struct mvsocts_softc *sc = sme->sme_cookie;
    118 	uint32_t val, uc, uk;
    119 
    120 	val = bus_space_read_4(sc->sc_iot, sc->sc_ioh, TS_STATUS);
    121 	if (!(val & STATUS_VALID)) {
    122 		aprint_error_dev(sc->sc_dev, "status value is invalid\n");
    123 		return;
    124 	}
    125 	uc = VAL2MCELSIUS(STATUS_VAL(val)) * 1000000;	/* uC */
    126 	uk = uc + 273150000;				/* convert to uKelvin */
    127 	sc->sc_sensor.value_cur = uk;
    128 	sc->sc_sensor.state = ENVSYS_SVALID;
    129 }
    130